244 AMERICAN MIDLAND NATURALIST. 
"Starting point” of our nomenclature, the Pteridium of J. 
Agardh is a homonym. 
Some of the species of the genus are: 
(Pteridium (Kutz.)i J. Agardh, not of Scopoli. ) 
(Pteridium, Kutz.) as subgenus in Hypoglossum.t 
(1) Pteridium alatum (Hudson) J. Agardh. 
Fucus alatus, Hudson. 
Delesseria alata (Hudson) Lamour 
(2) Pteridium spinulossum (Ruprecht) 3 Agardh. 
(3) Pteridium Juergensii, J. Agardh. 
(4) Pteridium Baerii, Ruprecht. 
t As subgenus under bayer (aki Kg. 
Kutzing, F. G. Species Algarum, 1849. . 811, also 
Kutzing, F. G. Phycologia aa $5 p. 445 
As subgenus under oram ria. 
Agardh, J. G. Spec gar. 2. p. 683. (1852). Vol. 3. p. 483 (1876). 
Harvey, W. H. Ns pus Am. 3, p. 94 (1853 yi 
ERRATA. 
Page 198, line 4, for Viola Lunellii, read Viola subvestita. 
“ 207, insert between lines 25 aa 26: Spicae laterales 1-2.5 
em. longae, angustatae, et spica quidem. 
da 207, line 27. Strike out this whole line. 
